ref: b15b45137188816b2bceecd1844c23c9b678e5d3
dir: /utils/grp.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <bio.h>
typedef struct Hdr Hdr;
struct Hdr{
u8int dx;
u8int dy;
u8int w;
u8int h;
u32int ofs;
};
int split, pcx, npal, idxonly;
Biobuf *bf;
uchar *bufp;
u32int pal[256], bgcol = 0xffff00;
void *
emalloc(ulong n)
{
void *p;
if((p = mallocz(n, 1)) == nil)
sysfatal("emalloc: %r");
setmalloctag(p, getcallerpc(&n));
return p;
}
void
putcol(u32int c)
{
if(pcx)
*bufp++ = c >> 24;
*bufp++ = c >> 16;
*bufp++ = c >> 8;
*bufp++ = c;
}
u8int
get8(void)
{
uchar v;
if(Bread(bf, &v, 1) != 1)
sysfatal("get8: short read");
return v;
}
u16int
get16(void)
{
u8int v;
v = get8();
return get8() << 8 | v;
}
u32int
get32(void)
{
u16int v;
v = get16();
return get16() << 16 | v;
}
void
getpcxpal(char *f)
{
int i, n, a, fd;
uchar *buf, *bp;
u32int v, *p;
Memimage *im, *im1;
if((fd = open(f, OREAD)) < 0)
sysfatal("getpcxpal: %r");
if(memimageinit() < 0)
sysfatal("memimageinit: %r");
if((im = readmemimage(fd)) == nil)
sysfatal("readmemimage: %r");
close(fd);
if(im->chan != RGB24){
if((im1 = allocmemimage(im->r, RGB24)) == nil)
sysfatal("allocmemimage: %r");
memfillcolor(im1, DBlack);
memimagedraw(im1, im1->r, im, im->r.min, memopaque, ZP, S);
freememimage(im);
im = im1;
}
if(Dx(im->r) != 256)
sysfatal("invalid pcx palette: %d columns", Dx(im->r));
n = Dx(im->r) * Dy(im->r);
npal = Dy(im->r);
buf = emalloc(n * sizeof *pal);
if(unloadmemimage(im, im->r, buf, n * sizeof *pal) < 0)
sysfatal("unloadmemimage: %r");
freememimage(im);
/* FIXME */
//for(i=0, p=pal, bp=buf; i<npal; i++, p++, bp+=256*3){
for(i=0, p=pal, bp=buf+20*3; i<npal; i++, p++, bp+=256*3){
v = bp[0] << 24 | bp[1] << 16 | bp[2] << 8;
a = 0x7f;
switch(npal){
case 63:
if(i > 47)
a = 0xff / (1 + exp(-i + 48 - 3.4) / 0.75);
/* logistic growth function
* max / (1 + exp(-x + xofs) / slope) + yofs
* fplot -r '0:47 0:255' '255 / (1 + exp((20 - x) / 4)) + 0'
*/
else
a = (0xff + 1) / (1 + exp((16 - i) / 3.5)) + 0;
break;
/* FIXME */
case 40: a = i < 33 ? 0xff * i / 32 : 0xff * (6 - (i - 33)) / 6; break;
case 32: a = 0xff * i / 30; a = a > 0xff ? 0xff : a; break;
case 1: break;
default: sysfatal("unknown palette size %d", npal);
}
*p = v | a;
}
free(buf);
}
void
getpal(char *f)
{
uchar u[3];
u32int *p;
Biobuf *bp;
if((bp = Bopen(f, OREAD)) == nil)
sysfatal("getpal: %r");
for(p=pal; p<pal+nelem(pal); p++){
if(Bread(bp, u, 3) != 3)
sysfatal("getpal: short read: %r");
*p = u[2]<<16 | u[1]<<8 | u[0];
}
Bterm(bp);
}
void
usage(void)
{
fprint(2, "usage: %s [-csx] [-b bgcol] pal pic\n", argv0);
exits("usage");
}
/* unpack a GRP file containing sprites.
* palette may be a plain file with 256 RGB24 entries (3*256 bytes)
* or a decoded PCX image serving as a palette.
* in that last case, palette must be provided in image(6) format,
* and palette indexes in the grp reference a column (palette) in
* the PCX image, which is used to implement transparency.
* we use the first column to set color and an alpha value for
* compositing, rather than use remapping with the PCX palette.
*/
void
main(int argc, char **argv)
{
int fd, n, x, y;
char *s, c[9];
u8int i;
u16int ni, maxx, maxy, *ofs;
uchar *buf;
Hdr *h, *hp;
Biobuf *bo;
ARGBEGIN{
case 'b': bgcol = strtoul(EARGF(usage()), nil, 0); break;
case 'c': idxonly = 1; break;
case 's': split = 1; break;
case 'x': pcx = 1; break;
default: usage();
}ARGEND
if(argv[0] == nil || argv[1] == nil)
usage();
if(pcx)
getpcxpal(argv[0]);
else
getpal(argv[0]);
if((fd = open(argv[1], OREAD)) < 0)
sysfatal("open: %r");
if((bf = Bfdopen(fd, OREAD)) == nil)
sysfatal("Bfdopen: %r");
ni = get16();
maxx = get16();
maxy = get16();
bo = nil;
h = emalloc(ni * sizeof *h);
buf = emalloc(maxx * maxy * sizeof(u32int) * (split ? 1 : ni));
ofs = emalloc(maxy * sizeof *ofs);
s = emalloc(strlen(argv[1]) + strlen(".00000.bit"));
for(hp=h; hp<h+ni; hp++){
hp->dx = get8();
hp->dy = get8();
hp->w = get8();
hp->h = get8();
hp->ofs = get32();
}
bufp = buf;
if(!split && (bo = Bfdopen(1, OWRITE)) == nil)
sysfatal("Bfdopen: %r");
chantostr(c, pcx ? ARGB32 : RGB24);
for(hp=h; hp<h+ni; hp++){
if(split){
sprint(s, "%s.%05zd.bit", argv[1], hp-h);
if((bo = Bopen(s, OWRITE)) == nil)
sysfatal("Bfdopen: %r");
Bprint(bo, "%11s %11d %11d %11d %11d ", c,
hp->dx, hp->dy, hp->dx+hp->w, hp->dy+hp->h);
}
Bseek(bf, hp->ofs, 0);
for(y=0; y<hp->h; y++)
ofs[y] = get16();
if(!split){
for(y=0; y<hp->dy; y++)
for(x=0; x<maxx; x++)
putcol(bgcol);
}
for(y=0; y<hp->h; y++){
if(!split)
for(x=0; x<hp->dx; x++)
putcol(bgcol);
Bseek(bf, hp->ofs + ofs[y], 0);
x = 0;
while(x < hp->w){
i = get8();
n = i & 0x7f;
if(i & 1<<7){
x += n;
while(n-- > 0)
putcol(bgcol);
}else if(i & 1<<6){
n &= 0x3f;
x += n;
i = get8();
if(pcx && --i >= npal)
sysfatal("invalid pal index %d", i);
while(n-- > 0){
if(!idxonly)
putcol(pal[i]);
else
putcol(0xff0000 | i);
}
}else{
x += i;
while(n-- > 0){
i = get8();
if(pcx && --i >= npal)
sysfatal("invalid pal index %d", i);
if(!idxonly)
putcol(pal[i]);
else
putcol(0xff0000 | i);
}
}
}
if(!split)
for(; x<maxx-hp->dx; x++)
putcol(bgcol);
}
if(!split)
for(y+=hp->dy; y<maxy; y++)
for(x=0; x<maxx; x++)
putcol(bgcol);
else{
Bwrite(bo, buf, bufp - buf);
Bterm(bo);
bufp = buf;
}
}
if(!split){
Bprint(bo, "%11s %11d %11d %11d %11d ", c, 0, 0, maxx, maxy * ni);
Bwrite(bo, buf, bufp - buf);
Bterm(bo);
}
exits(nil);
}